Antioffset mechanism for printing presses



Auge m 9 119% 1,595,

' I R J. GREENWAY ANTIOFF'SET MECHANISM FOR PRINTING PRESSES Filed March5. 1925 SNVENTOR ATTORNEYS Patented Aug. 10, 1926.

UNIT D STATES 1,595,085 PATENT orrrcn.

RICHARD J'. ennnnwnr, or WESTERLY, nnonn ISLAND, nssnanon 'ro o. n.oo'rTnELL a some COMPANY, or STONINGTON, connncrrcur, AconPoRA'rIoN orDELAWARE.

ANTIOFFSET MECHANISM FOR PRINTING PRESSES.

Application filed March 3, 1925. Serial No. 12,846.

The object of my invention is to provide certain improvements in theconstruction, form and arrangement of the several elements of theanti-offset mechanism whereby 5 the antf-ofiset powder is applied to theside of the traveling offset blanketwhich comes in contact with afreshly printed side of the travelingweb, whereby smutting or stickingof the sheets in the delivery pile is prevented and whereby theeffective life of the offset blanket is materially increased.

A practical embodiment of my invention is represented in theaccompanying drawings, in which-- Fig. 1 represents in side elevation somuch of a web perfectin printing press as includes my improveanti-offset mechanism.

Fig. 2 represents a longitudinal vertical 2 section through thesame.

printed upon one side of the first printing unit (not shown herein) isrepresented as passing around the impression cylinder 2 of the secondprinting 'un1t to be printed onits opposite side. This impressioncylinder 2 has its shaft 3 suitably mounted in the frame 4.

The offset blanket 5 leads from the let-off roll 6 around the rolls 7, 8and 9, to and around the impression cylinder 2 beneath the traveling web1 in contact with its freshly printed underside; and from thence theolfset blanket 5 leads around the rollslO and 11 to the take-up roll 12which is driven by the usual rollers 13 and 14 upon which it rests.

Anti-offset powder is applied to the side of,the offset blanket 5 whichcomes in contact with the first freshly printed side of the travelingweb 1 as it passes around the impression cylinder 2. In the presentinstance I provide an anti-offset powder supply fountain 15, having afountain roll 16, arranged in position to apply the anti-offset powderdirectly to the traveling offset blanket 5, whereby the powder isbrought 'into direct contact with the first freshly printed side of thetraveling web 1.

An adjustable doctor knife 17 is mounted in the fountain 15 in positionto regulate the amount of anti-offset owder applied by the fountain rollto the 0 set blanket.

The traveling web, the impression cylindar, the ofiset blanket and thefountain The traveling web 1 which has just been face speed.

It will be seen that by this arrangement I am enabled to apply theanti-offset powder to the side of the offset blanket in regulablequantities for application thereby to the first freshly printed side ofthe traveling web, thereby not only preventing the sheets cut from theweb from smutting in the delivery pile but also preventing theoffsetting onto the blanket, thereby-materially the effective life ofthe blanket.

It is evident that various changes may be r'esorted to in theconstruction, form and arrangement of the several parts withoutdeparting from the spirit and scope of my invention; hence, I do notintend to limit myself to the particular embodimentv herein shown anddescribed, but

WVh'at I claim is 1. A traveling offset blanket, means for applyinganti-offset powder thereto, to revent offset thereon, comprising ananti-o set powder supply fountain and a fountain roll contacting withsaid blanket, and means for driving the blanket and roll at the samesurlengthening 2. A traveling offset blanket, means for applyinganti-offset powder to the side of the blanket which-comes in contactwith the freshly printed side of a traveling web, said means comprisingan anti-offset supply fountain and a fountain roll contacting with saidblanket, and means for driving the blanket and roll at the same surfacespeed.

3. A rotary cylinder, around which a freshly printed web is passed, anoffset blanket passing around the cylinder under said we means forapplying anti-offset powder to the side of the blanket which comes incontact with the freshly printed side of the web, and means for drivmgthe cylinder and blanket at the same surface speed. 1

rotary cylinder, around which a v 4. A freshly printed web is assed, anoffset blanket assing around t e cylinder under said wed, I powder tothe side of the blanket which comes in cont-act with the freshly printedmeans for applying anti-offset side of the Web, said means comprising ananti-offset supply fountain and a fountain roll contacting with saidblanket, and means for driving the blanket and roll at the same surfacespeed.

5. A rotary cylinder, around which a freshly printed Web is passed, anoffset blanket passing around the cylinder under said Web, means forapplying anti-offset powder to the side of the blanket which comes incontact with the freshly printed side of the Web, said means comprisingan anti-offset supply fountain and a fountain roll contacting with saidblanket, and means for driving the cylinderyblanket and fountain roll atthe same surface speed.

In testimony, that I claim the foregoing as my invention, I have signedmy name this 27th day of February A. D. 1925.

- RICHARD J. GREENWVAY.

